> Date: Thu, 09 Sep 2004 22:37:31 +0200 > From: =?ISO-8859-1?Q?S=F8ren_Schmidt?= <sos_at_DeepCore.dk> > > Kevin Oberman wrote: > > > Here are the results of my last test back in May plus tests done on a > > kernel built from sources downloaded on Sep. 6. Is that going to catch > > your fix? I don't see much difference. Do you have version number I can= > > > check? > > Sep 6 should be fine if we are talking -current, on RELENG_5 it=20 > "depends" since the MFC was done on the 6'th.. > >=20 > > Buffer V4 Read V4 Write V5 Read V5 Write =20 > > 512 8385790 8111781 6921714 5115853 7130873 5261294 > > 1k 15457027 14865113 12330562 7811422 12494677 7952281 > > 2k 25677856 25273251 19939822 10572186 20137339 10708676 > > 4k 27083255 25897711 27096896 12860586 27064850 12982472 > > 8k 27079563 26033768 27097726 14416520 27017494 14497783 > > 16k 27082575 Oops! 27082273 15316924 26936316 15374888 > > 32k 27080720 25908336 27100118 15816203 26977041 15853140 > > 64k 27079904 26008387 27096093 16073422 26939153 15938326 > > 128k 27055901 25928520 27095673 16073422 > > 256k 27076467 25918950 27090967 16118789 > > 512k 27045087 25987266 27077925 16006708 > > 1m 27026694 25738575 27060626 15879266 > >=20 > > Read: dd if=3D/dev/ad2 of=3D/dev/null bs=3Dnnn > > Write:dd if=3D/dev/zero of=3D/dev/ad2 bs=3Dnnn > > All tests run for about 30 seconds. > > All tests in single-user mode. Nothing on ad2 is mounted. > > Debug (WITNESS, INVARIANTS, malloc checking) disabled. > > > While the test is running, the disk being written to "sings" with the > > frequency somewhat dependent on the size of the write. On read, I get > > silence. When I copy my full disk (if=3Dad0 of=3Dad2), I can clearly he= > ar > > the sound of the actuator moving the heads constantly toward the end of= > > > the backup. I assume that they are being returned to track 0 on a > > repeated basis. > > There should be no seeks on a lone write to the raw disk, if there is=20 > you have HW problems as the driver doesn't issue any seeks at all then. > > What disks are this BTW ? This was RELENG_5 on the 6th at 22:55 UTC. cvsup from my local mirror, so it may have been up to about 70 minutes old. The "singing" only happens when running V5. I have no such sound when I do the same thing with V4. The disk is an Toshiba MK4019GAX. 40 GB ATA100 5400RPM. I get the same performance, though, when using an IBM (now Hitachi) 40GB, ATA100 5400RPM drive. What I am seeing looks a lot like what Bjoern was seeing, so it's not unique to this system. Once again, it's fine on V4. And, it works on Windows. (I just had to say that. I have not actually tested under Windows.) -- R. Kevin Oberman, Network Engineer Energy Sciences Network (ESnet) Ernest O. Lawrence Berkeley National Laboratory (Berkeley Lab) E-mail: oberman_at_es.net Phone: +1 510 486-8634Received on Thu Sep 09 2004 - 19:05:41 UTC
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